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   难度：Easy
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   <h1 class="question_title">
    500. Keyboard Row
   </h1>
   <p>
    Given a List of words, return the words that can be typed using letters of
    <b>
     alphabet
    </b>
    on only one row's of American keyboard like the image below.
   </p>
   <p>
    &nbsp;
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   <p>
    <img alt="" src="https://assets.leetcode.com/uploads/2018/10/12/keyboard.png" style="width: 100%; max-width: 600px">
   </p>
   &nbsp;
   <p>
    <b>
     Example:
    </b>
   </p>
   <pre>
<b>Input:</b> ["Hello", "Alaska", "Dad", "Peace"]
<b>Output:</b> ["Alaska", "Dad"]
</pre>
   <p>
    &nbsp;
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   <p>
    <b>
     Note:
    </b>
   </p>
   <ol>
    <li>
     You may use one character in the keyboard more than once.
    </li>
    <li>
     You may assume the input string will only contain letters of alphabet.
    </li>
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   <h1 class="question_title">
    500. 键盘行
   </h1>
   <p>
    给定一个单词列表，只返回可以使用在键盘同一行的字母打印出来的单词。键盘如下图所示。
   </p>
   <p>
    &nbsp;
   </p>
   <p>
    <img alt="American keyboard" src="https://assets.leetcode-cn.com/aliyun-lc-upload/uploads/2018/10/12/keyboard.png" style="width: 100%; max-width: 600px">
   </p>
   <p>
    &nbsp;
   </p>
   <p>
    <strong>
     示例：
    </strong>
   </p>
   <pre><strong>输入:</strong> ["Hello", "Alaska", "Dad", "Peace"]
<strong>输出:</strong> ["Alaska", "Dad"]
</pre>
   <p>
    &nbsp;
   </p>
   <p>
    <strong>
     注意：
    </strong>
   </p>
   <ol>
    <li>
     你可以重复使用键盘上同一字符。
    </li>
    <li>
     你可以假设输入的字符串将只包含字母。
    </li>
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